Jakarta, Sep 7 (DPA) A strong earthquake registering 6.8 on the Richter scale struck off the southern coast of the Indonesian island of Java late Monday, but there were no immediate reports of injury or damage, the Indonesian seismology agency said.

The quake struck at 11.12 p.m. (1612 GMT) and was centred in the Indian Ocean, 263 kilometres south-east of Wonosari district in Central Java province, Indonesia's National Meteorology and Geophysics Agency said in a statement.

It occurred 35 kilometres beneath the seabed. The statement did not say if the quake caused a tsunami threat.

There were no immediate reports of injury or structural damage from the quake, the latest of a series of earthquakes to jolt Indonesia in recent days.